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Hello. The instructions can vary from model to model, but most have a green indicator light that lights up when the unit detects a stud. There is a section in the manual (for most models) that will show/inform of the unit's individual method. Here is a link to the company's product manual support page. Click on your specific model to download the manual.

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I suspect there are several models but I have one model. 1) Turn on the unit (if the green light is blinking replace the battery). 2) Calibrate the unit by holding it flat against the wall for 5 seconds until the red light goes off and the beep stops. Make sure you do not move the unit during the calibration or position the unit over a stud (try a spot 6-12" away from the corner of the wall - most studs are on 16" or 24" centers and the wood/metal stud is 1 1/2" thick). If the unit keeps beeping or the red light doesn't go off during the calibration, move the unit sideways 5-8" in case you are above a water pipe or other reason for "too deep a surface" for the unit.

3) Do not lift the unit off the wall or you will need to recalibrate it. Slide the unit across the wall. When the upper red light comes on and the beeping starts, that marks one edge of the object in the wall (stud). Continue until the red light goes off and the beeping stops. Mark the other edge of the stud by moving the stud finder in the opposite direction and marking when the red light comes on and the beeping starts. The center of the two marks is the center of the stud for securing anything to the wall.

If the beep persists over a 6" range, I'd check if you have any old cast-iron pipes or a door/window that was relocated in that wall. Repeating the test in a few places vertically along that spot of the wall will tell you there is a consistent large object in that location. Neither a filled in window or door will run the entire length of the wall but you could be finding the headers (the vertical framing of the opening would probably be ~4-6" wide (double or triple stud depening on the needs of the house design)).

I hope this helps.

Cindy Wells (on another stud-finder that I borrow, you press the buttons on the right and left side to turn it on. Calibrate by holding it to the wall for a short while and then slide it across the wall. Note when the top red led lights and the beep starts. Repeat in reverse to find the other side of the stud.)

Hello. The instructions can vary from model to model, but most have a green indicator light that lights up when the unit detects a stud. There is a section in the manual (for most models) that will show/inform of the unit's individual method. Here is a link to the company's product manual support page. Click on your specific model to download the manual.

These usually need to be calibrated in a stud-less section of the wall so that the LED just goes out. Slide the finder over the wall slowly until the light turns on--that is the first edge. Continue moving and the LED should go out--that is the second edge. These two points should be marked lightly with a pencil and the midpoint between the marks locates the center of the stud. Note that these tools will respond to wiring in the wall the same way. Hope this helps!